Variable valve actuating apparatus for internal combustion engine

a technology of variable valves and actuating devices, which is applied in the direction of valve arrangements, machines/engines, output power, etc., can solve the problems of limited improvement in engine starting performance, and achieve the effect of improving the startability or starting performance of an engine more reliably and improving the startability or starting performance of an engin
US20080011253A1Inactive Publication Date: 2008-01-17HITACHI ASTEMO LTD
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
HITACHI ASTEMO LTD
Publication Date
2008-01-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

A variable valve actuating apparatus for an internal combustion engine includes a valve actuating mechanism to vary an actual valve operating characteristic of the engine. A controller sets a target valve operating characteristic in accordance with a crank angle position of the engine before a start of the engine, and delivers a changeover control signal to the valve actuating mechanism to control the actual valve operating characteristic to the target valve operating characteristic before an end of a cranking operation of the engine.
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Description

BACKGROUND OF THE INVENTION

[0001] The present invention relates to variable valve operating or actuating apparatus and / or process suitable for improving engine starting performance.

[0002] There is a demand for accurate control of a valve timing (opening timing and / or closing timing) of an engine valve, especially of an intake valve at an initial stage of an engine starting operation, for recent stringent regulations against exhaust emission, and increase of frequency of engine restarts in a hybrid vehicle.

[0003] Accordingly, there are proposed various valve actuating apparatus for controlling the opening and closing timings of an engine valve in accordance with an engine operating condition by varying a relative rotational phase between a timing sprocket and a vane fixed to a camshaft by the use of oil pressure.

[0004] In the case of such a hydraulic actuating mechanism, when the engine speed is very low as in an engine starting operation, a control oil pressure is low and the hydraulic ...

Claims

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